Research article

Bud burst and flowering phenology in a mixed oak forest from Eastern Romania

Ecaterina Nicoleta Chesnoiu , Nicolae Șofletea, Alexandru Lucian Curtu, Alin Toader, Raul Radu, Mihai Enescu

Ecaterina Nicoleta Chesnoiu
Forest Research and Management Institute, Eroilor Bd. 128, Voluntari, Ilfov, Romania. Email: cathyches@yahoo.com
Nicolae Șofletea
Transilvania University of Brașov, Șirul Beethoven 1, 500123- Brașov, Romania
Alexandru Lucian Curtu
Transilvania University of Brașov, Șirul Beethoven 1, 500123- Brașov, Romania
Alin Toader
Transilvania University of Brașov, Șirul Beethoven 1, 500123- Brașov, Romania
Raul Radu
Transilvania University of Brașov, Șirul Beethoven 1, 500123- Brașov, Romania
Mihai Enescu
Transilvania University of Brașov, Șirul Beethoven 1, 500123- Brașov, Romania

Online First: January 30, 2009
Chesnoiu, E., Șofletea, N., Curtu, A., Toader, A., Radu, R., Enescu, M. 2009. Bud burst and flowering phenology in a mixed oak forest from Eastern Romania. Annals of Forest Research 52(1): 199-206.


Bud burst and flowering phenology have been observed in year 2008 in a natural white oak species complex situated in eastern Romania. A total of 300 mature individuals was mapped and identified based on leaf morphology. The community consists of four oak species: Quercus pedunculiflora, Q. robur, Q. pubescens and Q. petraea. A set of 28 individuals could not be unambiguously classified to one or another species. Data on bud burst showed a normal distribution and the differences among species were small. The "very late" flushing was recorded on 15th of April, three weeks later when compared to early flushing individuals. The time period between the bud burst and the complete development of leaves was nearly the same in all oak species, varying on average, between 18.4 and 20.6 days. The spatial distribution of phenological groups within the complex appears to be non-randomly, because in many parts of the study plot exist groups in which most of the trees belong to the same phenological category. Our results indicate an overlap in flowering time for all oak species which occur in the area. The data support the hypothesis that interspecific gene flow is possible between closely related oak species.

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